Ring Intercom doesn't work on CAME BPT Opale - Ring Intercom - Ring Community

I’m pretty confident that I’ve correctly wired Ring Intercom to the bus CAME BPT Opale White system, which is listed on Ring’s site as compatible. I’ve read the intercom schematic and tried a few different combinations, and other people have had success with B1/B2 into each of the two “B” Bus ports. However, when testing, the Ring device is never able to answer the call from our intercom. It does try to respond - you can tell because the screen flashes when Ring Intercom communicates with our

Ring Intercom not working with Came BPT YC/300A - Ring Intercom - Ring Community

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Ring Intercom setup unsuccessful (SKS HT4600) - Ring Intercom - Ring Community

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Ring Intercom not working - Ring Intercom - Ring Community

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Ring Intercom setup unsuccessful (SKS HT4600) - Ring Intercom - Ring Community

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Ring Intercom not working - Ring Intercom - Ring Community